MODELING OF GNATOMETRIC INDICES DEPENDING ON PARAMETERS OF BASAL CRANIAL STRUCTURES IN BOYS AND GIRLS WITH ORTHOGNATHIC BITE
DOI:
https://doi.org/10.11603/2415-8798.2018.1.8764Keywords:
regression analysis, gnatometric indices, sizes of basal cranial structures, boys and girls with orthognathic bite.Abstract
For the possibility of forming an objective basis for determining the diagnosis and creating the ultimate goal of orthodontic treatment, it is necessary to have a clear understanding of the individual variables of the basic metric characteristics of certain individual parameters of bone structures and soft facial tissues.
The aim of the study – to construct and analyze the regression models of gnatometric indices, depending on the parameters of basal cranial structures in boys and girls with orthognathic bite.
Materials and Methods. Teleroentgenography and computed tomography studies were performed on 38 boys (aged from 17 to 21) and 55 girls (aged from 16 to 20 years) who had a physiological bite as close as possible to orthognathic. The construction of regression models of gnatometric indices, depending on the parameters of basal cranial structures, was carried out in the licensed package "Statistica 6.0".
Results and Discussion. As a result of the regression analysis conducted in the boys with orthognathic occlusion, the following models of gnatometric parameters were constructed depending on the parameters of the basal cranial structures: effective length of the maxilla = - (16.11+1.01)×distance Se_N + 0,45×magnitude of the base of the maxilla + 0.28×distance S_E (determination factor is 0.612); length of the upper jaw = - (15.42+0.50) ×distance Se_N + 0.50×the size of the base of the upper jaw (the determination coefficient is equal to 0.550); angle SND = 107.8 – 0.47×H-angle + 0.39×magnitude of the base of the upper jaw – 0.38×distance S_E (determination coefficient is equal to 0.502); distance S_L = (13.05+1.51) ×distance Se_N – 0.87×H-angle – 0.86×distance S_E + 0.63×magnitude of the base of the upper jaw (determination coefficient is 0.626).
Conclusions. Of the 43 possible regression models of gnatometric indices, depending on the parameters of the basal cranial structures in boys with orthognathic occlusion, only 4 valid models with a determination coefficient greater than 0.5 were constructed, namely, effective length of the upper jaw, maxilla length, SND angle and distance S_L. In girls with orthognathic bite, models with a determination coefficient greater than 0.5 are not built at all.
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